You should read the entire thing, but here's a nice sample:
Nevertheless, over the past several decades an increasing number of scientists have shed the restraints imposed by the scientific method and begun to proclaim the truth of man-made global warming. This is a hypothesis that remains untested, makes no predictions that can be tested in the near future, and cannot offer a numerical explanation for the limited evidence to which it clings. No equations have been shown to explain the relationship between fossil-fuel emission and global temperature. The only predictions that have been made are apocalyptic, so the hypothesis has to be accepted before it can be tested.
The only evidence that can be said to support this so-called scientific consensus is the supposed correlation of historical global temperatures with historical carbon-dioxide content in the atmosphere. Even if we do not question the accuracy of our estimates of global temperatures into previous centuries, and even if we ignore the falling global temperatures over the past decade as fossil-fuel emissions have continued to increase, an honest scientist would still have to admit that the hypothesis of man-made global warming hardly rises to the level of "an assertion of what has been or would be the result of carrying out a specified observational procedure." Global warming may or may not be "the greatest scam in history," as it was recently called by John Coleman, a prominent meteorologist and the founder of the Weather Channel. Certainly, however, under the scientific method it does not rise to the level of an "item of physical knowledge."
I have to admit that, when it comes to atmospheric science, I'm not much better off than a layman. I'm a chemist and molecular biologist by training, so much of the physics that goes into it is beyond me. However, I can tell when something is not being put to the rigorous scrutiny that science demands. All I've ever seen out of the global warming "debate" is a great PR blitz; Don't question it, don't try to understand it, just go along with it or else you're evil.
This wouldn't be so big a deal if the goal were to just get global warming acknowledged. However, the larger goal is a restructuring of societies and economies at a scale that has never been seen in human history before. It's not irresponsible to suggest that we should have more debate, and better confirmation, of the apocalyptic predictions that global warming could
unleash before drastically altering everything that has made humanity prosperous since the 19th century.
My preferred solution is to wait. When predictions like these are made, they seem to assume a static level of technology. Who's to say that 50 years from now there won't be technology that will either give better information or allow for better handling of any actual problems that might arise? I'm not arguing that we should bank on solutions that don't yet exist, but to assume that only the environment will be different in that amount of time is just as silly.
Ahem, all that aside, read the whole article.
Related: Global Warming as Mass Neurosis